The On-Line Encyclopedia of Integer Sequences (OEIS)

A078860 revision #3

A078860

Least positive residues [mod 210] representing those residue classes which can be lesser of prime pairs from A029710.

7, 13, 19, 37, 43, 67, 79, 97, 103, 109, 127, 139, 163, 169, 187, 193

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..16.

FORMULA

Intersection[RRS(210), 4+RRS{210)]-4 and {7}. RRS[210]=reduced residue system of 210=first 48=phi[210] terms of A008364; additional term 7 is a singular cases; 210k+r generates complete A029710 with suitable k and r taken from these 15+1 numbers.

MATHEMATICA

t=Flatten[Position[Table[GCD[w, 210], {w, 1, 210}], 1]] t2=Intersection[t, t+4]-4

CROSSREFS

Cf. A029710, A008364, A078859.

Sequence in context: A048646 A152087 A098059 * A029710 A145897 A078863

Adjacent sequences: A078857 A078858 A078859 * A078861 A078862 A078863

KEYWORD

fini,full,nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Dec 13 2002

STATUS

approved